Add unit tests for chained StringBuilder.AppendSmart() and StringBuil…

…der.AppendLineSmart()

#451

src/SmartFormat.Tests/Extensions/SmartExtensionsTests.cs

@@ -33,6 +33,17 @@ public void Test_AppendLine()
         Assert.That(actual, Is.EqualTo("these are the args" + Environment.NewLine));
     }
 
+    [Test]
+    public void Test_AppendLine_Chained()
+    {
+        var actual = new StringBuilder()
+            .AppendLineSmart("{0} {1} {2}", "these", "are", "the")
+            .Append("args")
+            .ToString();
+
+        Assert.That(actual, Is.EqualTo("these are the" + Environment.NewLine + "args"));
+    }
+
     [Test]
     public void Test_Append()
     {
@@ -44,6 +55,18 @@ public void Test_Append()
         Assert.That(actual, Is.EqualTo("these are the args"));
     }
 
+    [Test]
+    public void Test_Append_Chained()
+    {
+        var actual = new StringBuilder()
+            .AppendSmart("{0} {1}", "these", "are")
+            .Append(' ')
+            .AppendSmart("{0} {1}", "the", "args")
+            .ToString();
+
+        Assert.That(actual, Is.EqualTo("these are the args"));
+    }
+
     #endregion
 
     #region : TextWriterTests :